Dynamo-electric machine.



E. D. PRIEST.

DYNAMO ELEGTRIG MACHINE. APPLICATION nun rm. 1a, 1907 918,594. Patented Apr.20, 1909.

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Patented-Apr. 20, 1909.

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DYNAMQ-ELEcTRiG mncnm'ii.

To all whom it mayconcemf Bev it known that;I,-'EnWAnD D. Pnnis'r, a

citizen- UnitedfStates, residing at Schenectady; in the county ,of Schenectadyand State of hl ew York, have invented cer taln new and useful-Improvements. in Dynamo-Electric Machines, of which the following is aspecificationL The space which is available forzthe reception Offl dynamo-electric machine is often so limited that it is necessary to econo-.

mize in the dimensions of the machine in every poss ble way wlthout decrease in power. This is particularly true of motors intended for railway purposes. Tl ese motors are, mounted on the trucks of the cars or locomotives and canbe allotted only a limited space, especially in the vertical direction, While railway motors are required to be extremely compact, it is also essential that they may be taken apart readily without danger of producing disturbances which would affect their proper operation.- when again assembled. v j Y The object of my invention is to provide a simple and effective arrangement whereby compactness, together with ease of assembly and replacement of the parts,,is secured. To this end-I so arrange the laminae of the armature core body that they are carried directly upon the armature .shaft, namely, without the intervention of=the sleeve-or the like. lhe laminae, which are arranged between the usual 'end-plateaf are clamped be tween shoulders on the: shaft,;-one of the shoulders being preferably-in the form of a n'ut so as to be adjustable along the'shaft.

By this arrangement the diameterof the corebody is reduced to a'minimunn'since all" of the cross-sectional area is occupied by lmetal which is necessary either for mechanical stren thbr' for'the purposeofforming tachable bolts arranged; to extendfjthrough part of t 1e magnetic circuit. It is often necessary to be able to remove the armature ,fr omthe shaftwithout,disturbing the parts oft-he armature itself or,its connection with longitudinal 3 ventilatingij channels in the laminae and one of the end pla whereby the clamping of the armaturef effected temporarily; independently of the l Specification of Letters Patent.

. ficat'ion.

Referring to the drawing, =1'is ,thefliame may be shaft. Furthermore, in order that the com:

removed from the shaft with the armature said sleeve. r

The various features constitut ng my in;

'ity in the appended claims; but for a full understanding thereof. reference'may bezhad to the following detailed description taken in connection with the accompanying draw lngs, wherein F gure 1 is a a railway motor arranged in accordancew ith a preferred form ofthe present-invention; Fig. 2 shows the armature withith'etempof ing ready for-removal; Figs. 3 and 4 show and Fig.

of a dynamo-electric machine which, in the drawings, is illustrated as an inclosed railway motor; 2 is the armature shaft mounted in suitable bearings 3 and 4 in" the frame of the machine. The armature consistsgof a laminated core body 5 arranged between eiid members 6 and 7 and haying suitablewind ings 8.- These parts, exceptas hereinafter indicated, may take any' usual or preferred of mounting the laminae of the armature core upon a sleeve, either connected to or separate from the end-plates, andthereby interposing ,useless metal in the structure, the lamina:

thereto by means of 'a key 901* other suitable device. When the armature is assembled mutato'r or other current collector may be" vention will be pointed out with particular rary fastening means inplace the shaft beare punched out so that they fit snugly upon the shaft, and, whenassembledjupon the f shaft, are prevented from rotation relative upon the shaft the end-plate 7 abuts against a shoulder 10 on the shaft, while the outer end of the sleeve on the other end-plate is or SOHENEOIIADY, NEW YORK, ASSIGNOR TOGENERAL ELECTRIC COMPANY, A'OORPORATION OF NEW roan. 1 v r Patented April 20, 190%; f 1 Application filed February 13, 1907. semi No. 319L120. v

without disturbing the connections between gthe armature winding and thecomnnitator," I provide one of the end-plateslo f'thearma-- ture core with laterally-projecting sleeve by which the currentcollector is' centered. In the preferred form of my invention I ex tend the sleeve so: that thecommutator is'not, onlyv centered thereby, but. mounted-on J longitudinal cross-section of details of the temporary fastening means;- 51s a fragmentary view ofa modi-' 1 8c forms the P r ular forms illustrated beiuyii simply indicative of general ty In ngaged by a nut 11 screw-threaded upon 118 armature shaft so that upon turning the nut the armature is tightly clamped between it and the shoulder 10. The commutator or {other current-collecting device 12 is centered shy and is preferably mounted-"uponfthe' "sleeve or extension 13 projecting from one sideof the end-plate 6, so that the connections vto th'e commutator are not disturbed as long as the armature core members remain clamped together. Suchan armature could notbe" removed from its shaft without dis- .arrangement of its parts unless-some means were provided for temporarily clamping it armature.

end-plates, namely the plate 6, there are arto ether.- For this purpose I make use of bo ts or other suitable fastening means. which may be inserted through the ventilating channels in the core body so as to clam the laminae together independently of the shaft.

In the motor illustrated, the armature'core is provided with longitudinal ventilating channels 14 and transverse channels 15 connecting the channels 141 with the periphery of the On the inner side of one of the ranged inalinement with some or all of the flongitudinal channels, screw-threaded sock ets ,16. The longitudinal channels may-extend entirely through the end member 7 or this member may be made in the form of an armed ider'as shown. Temporary clam ing is e e'cted by inserting bolts 17',- extending through the entirefcore body, through auxiliary end plate 18 which may be slipped upon the shaft and brought against the arms 0 the spider. The bolts are passed through openings 19 in the auxiliary plate, which register with the channels 14, the bolt heads v resting against the outer side of the plate.

thenut llplaced in position, whereupon the temporary clamp may be removed without; disarr-anging any ofthe parts.v Thus,dur-. ,ing the operation of the machine, the-longi- In Fig. 1 the motor is illustrated in its assembled form. In Fig. 2' the temporary clamping means is shown in place, while the clampingunt 11 on the armature shaft-has been removed. It will be seen that the-shaftmay no w? be pressed out through the rigl'ithand end of-the armature without disturb ing the armature or the commutator. IVhen I it is desired to again replace the shaft, the parts are assembled-as shown in Fig. 2, and

tudinal ventilating openings are entirely clear and fully serve theirfpurpose as ventilating means However, when it is desired to remove the armaturefrom the shaft, these openings, wlnch for thetnne being are idle,

are made usefulfor receiving the temporary clamp. A minimum core diameter is-there fore obtained without interference with the ease of removal and subsequent assembly of the armature upon ts shaft. i

In Fig. 5, I have shown a slightly modified arrangement. In this form of my-invention the commutator 20, instead of being mounted upon a sleeve pro ecting] from the end plate 21, is located directly upon the armature shaft 22. The end plate isprovided with a short tubular projection 23 c which extends into the interior of the commutator sleeve 2-1 for a short distance so as to center the commutator with respect. to the armature. The armature and commutator are secured in place by means of the :nut 25 which is screw-threaded upon the shaft and bears against the end of the sleeve 24. The

temporary clamping bolts 26, in this form,

pass entirely through the end plate 21 and are screw-threaded into the end" of the commutator sleeve as shown.

i hat I claim as new and desire to secure by Letters Patent of the United States, is, I 1. In a dynamo-electric machine, a shaft, a core body made up of laminae mounted directly upon said shaft and a pair ofend plates,a shoulder on said shaft engaged by one of said end plates, a nut screwed upon said shaft and engaging the otherof said end plates to clamp the core body together upon said shaft,-sa1d core body having lon-.

gitudinal ventilating channels extending through 'the laminae and one of said end plates, a sleeve projectin from one of said end plates, a current collector centeredby said sleeve, windings-011 said core body connectedto said currentcollector, and detachable bolts arranged to extend through said channels for temporarily clamping the core body together independently of the shaft so that said shaft may be removed from said core body without disturbing the parts thereof or the connections of the windings with the current collector.

2. In a dynamo-electric machine, a shaft, 21 core body made up of laminae mounted directly upon saidshaft and a'pair of end plates, a'shoulder on said shaft engaged by one of said end plates, anut screwed upon said shaft and. engaging the other of said end] plates to clamp the core body together aipon said shaft, said core body having longitudinalventilating channels extending through the'laminac and one of said end plates, asleeve projecting from one of said end lates, a

current collector centered by: sai V sleeve, windings on said core body'oonnected to-said current collector, an auxiliary end plate fitting against one of said members and having- "openings therein registering with said ven' y or the connections of the windings with the tilating channels, and detachable bolts arcurrent collector. ranged to extend through said channels and i In Witness whereof, I have hereunto set the Openings in said auxiliary end plate for my hand this 11th day of February, 1907. '5 temporarily clamping said core body to- EDYVARD D. PRIEST.

gather independently of the shaft so that l Witnesses:

sziid s'haft'may be removed from said core BENJAMIN B. HULL, body Without disturbing the parts thereof HELEN ORFORD. 

